The invention discloses a preparation method for zinc gel of an alkaline zinc-manganese dioxide battery. The preparation method comprises the following steps: (1) putting aluminum, bismuth and rare earth metals into a pressure fuse, heating to be molten, pressing galvanizing zinc to produce a zinc alloy, and crushing to produce zinc alloy particles; (2) mixing the zinc alloy particles with polyacrylic acid, or methacrylic acid, polyacrylic ester or methyl propiolate, polyacrylate or methyacrylate, and indium oxide powder, and grinding into a zinc powder mixture with particle size of 50-100 micrometers; (3) putting the zinc powder mixture and electrolyte prepared in advance into a hybrid reactor according to the volume ratio of 1:1, heating to 50-70 DEG C, agitating and mixing for 30-60 minutes at the agitation speed of 1000 revolutions / minute-2000 revolutions / minute, thus preparing zinc gel. According to the zinc gel of the alkaline zinc-manganese dioxide battery, prepared by adopting the preparation method, the discharge capability is greatly improved, the service life is effectively prolonged, and the zinc gel of the alkaline zinc-manganese dioxide battery is lead-free and mercury-free, thus being more environment-friendly.